Well I recently found an issue and thought I’d use the newly opened JIRA to file it, but instead had to make it a forum post (see Bug: Library compatibility version differs between CMake and autotools build on macOS).
I consider filing issues and providing information about them part of collaboration just as much as submitting code patches. I was just surprised that the JIRA was essentially read only since the vast majority of open source projects have open issue trackers. See for example Qt, which has a process I think works very well.